work party vs road gang

work party and road gang both are nouns.

Word	Noun	Adjective	Verb	Adverb
work party	Yes	No	No	No
road gang	Yes	No	No	No

As nouns, road gang is a hyponym of work party; that is, road gang is a word with a more specific, narrower meaning than work party:

Other hyponyms of work party include shift, detail, chain gang, ground-service crew, ground crew, section gang, stage crew.

work party (noun)	road gang (noun)
an organized group of workmen	a gang of road workers